I took my vehicle to a shop in order to diagnose some severe driveability issues (it is a 96 G10 van with a 5.0 for reference). I was told that the fuel pressure was fine but the volume was "all over the place" once the van had warmed up.
The mechanic indicated that I need a fuel pump and filter. Now obviously I know the filter and pump are necessary for fuel delivery; however, I am a bit perplexed about what else might cause fuel volume issues. I have struggled to find information about fuel volume issues with fuel pressure being more widely covered. I would obviously expect a relationship between pressure and volume, but what could cause erratic fuel volume levels but acceptable pressure levels? In my case, according to shop, the fuel volume was problematic only after the van was warm, but, in general, what might be both the causes and symptoms of improper fuel volume levels? I personally would have expected a fault with one of the vehicle's electrical sensors, but this might be an misguided belief.